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grid point calculation

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&geogrid
parent_id = 1, 1,
parent_grid_ratio = 1, 3,
i_parent_start = 1, 31, # how to get this number 31?
j_parent_start = 1, 17, # how to get this number 17
e_we = 100, 112,
e_sn = 107, 97,

I would like to know how to calculate this number for e_we, e_sn for single domain and nested domain
 
&geogrid
parent_id = 1, 1,
parent_grid_ratio = 1, 3,
i_parent_start = 1, 31, # how to get this number 31?
j_parent_start = 1, 17, # how to get this number 17
e_we = 100, 112,
e_sn = 107, 97,

I would like to know how to calculate this number for e_we, e_sn for single domain and nested domain.
Kindly Help
 
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